| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 17 |
10.4%
|
| 1 | One hour or less | 3 |
1.8%
|
| 2 | 3 |
1.8%
|
|
| 3 | 1 |
0.6%
|
|
| 4 | 2 |
1.2%
|
|
| 5 | 7 |
4.3%
|
|
| 8 | 3 |
1.8%
|
|
| 10 | 11 |
6.7%
|
|
| 12 | 2 |
1.2%
|
|
| 15 | 1 |
0.6%
|
|
| 18 | 1 |
0.6%
|
|
| 20 | 26 |
16%
|
|
| 24 | 2 |
1.2%
|
|
| 30 | 17 |
10.4%
|
|
| 35 | 1 |
0.6%
|
|
| 40 | 32 |
19.6%
|
|
| 48 | 1 |
0.6%
|
|
| 50 | 5 |
3.1%
|
|
| 55 | 1 |
0.6%
|
|
| 60 | 4 |
2.5%
|
|
| 70 | 2 |
1.2%
|
|
| 75 | 1 |
0.6%
|
|
| 80 | 5 |
3.1%
|
|
| 90 | 1 |
0.6%
|
|
| 100 | 7 |
4.3%
|
|
| 120 | 5 |
3.1%
|
|
| 125 | 1 |
0.6%
|
|
| 300 | 1 |
0.6%
|
|
| Sysmiss | 142 |